Sauna Backrest S - Ergonomic sauna chair with backrest for sauna rooms W1787P235509Backrest can better let the human body to maintain a more correct sitting posture, the human body in normal life need to naturally bend over or sit straight waist, these two kinds of circumstances will make the muscles and ligaments around the lumbar spine tension, sitting for a long time easy to cause tension around the lumbar soft tissue. The elasticity and endurance of the muscles and ligaments of the lower back are poor, and there are varying